Install on Sonoma

Fresh install of macOS Sonoma 14.2.1 on MacBookPro M1 Max

`./build.sh` reports:

```
…
checking for ranlib... /usr/bin/ranlib
checking for gsed... no
configure: error: gsed must be available to build this library
…

I then did `brew install gsed` and got further:

```
…
checking for PTHREAD_PRIO_INHERIT... yes
checking for asm/page.h... no
checking for python... no
configure: error: Cannot find python in your system path
```

I then did `brew install python3`, same error. I presume that python3 is not symlinked as `keytool-cli` expects.

```
> whereis python3
python3: /usr/bin/python3 /opt/homebrew/share/man/man1/python3.1
> python3 --version
Python 3.9.6
> alias python='python3'
>
```

Still no luck `./build.sh` still reports `Cannot find python in your system path`

Start with ./build.sh and the configure checks shown in the report, focusing on the gsed and python detection failures on macOS Sonoma. Reproduce the build on the stated MacBookPro M1 Max environment and inspect the build configuration around those checks. Done means ./build.sh completes successfully on a fresh Sonoma installation.

索引モデルが issue の本文から書いたものです。